Blue-printing frame.



No. 867,698. PATENTED OUT. 8, 1907. J. A. BRIED. BLUE PRINTING FRAME.

APPLIOATION FILED 8EPT.27,1906.

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m I v WITNESSES: R LN'VENTOA,

A TTORNE Y.

JULIEN A. DRIED, OF SAN FRANCISCO, CALIFORNIA.

BLUE-PBINTIN G FRAME.

Specification of Letters Patent.

Patented Oct. 8, 1907.

. Application filed September 27, 1906. Serial No. 336,514.

To all whom it may concern:

Be it known that I, JULIEN A. Bruno, a citizen of the United States,residing at San Francisco, in the county of San Francisco and State ofCalifornia, have invented new and useful Improvements in Blue-PrintingFrames, of which the following is a specification.

This invention relates to photographic printing frames for printing fromflexible cliches, such as tracings, films, or the like, the object ofthe invention being to provide an improved construction of frame inwhich there will be no possibility of breakage of glass, which can beoperated quickly, which will dispense with the use of felt or otherpadding, and which will be lighter and easier to handle than frames ofprior construction.

In the accompanying drawing Figure 1 is a perspective view of the frame;Fig. 2 is a longitudinal section through the tension roller; Fig. 3 is adetail perspective view, partly in section on the line 33 of Fig. 2,showing the position of the pawl and ratchet device for tightening theroller, when in use.

Referring to the drawing, 1 indicates a skeleton frame of wood or othersuitable material, having the end pieces 2. Secured to said end piecesare the ends of an arched or convex base or foundation 3, preferably ofsheet metal, as aluminium. Secured to one end of said arched base is theend of a sheet 4 of thin celluloid, translucent, and preferablytransparent. The other end'of said sheet is secured to the circumferenceof a roller 5 carried by a shaft 6. Said shaft passes loosely throughthe ends of the roller, and a spiral spring 7 surrounds said shaft, oneend thereof being secured to the shaft and the other end to the endflange 8 of the roller. Upon the shaft outside the roller are secured atone end a ratchet wheel 9 and a handle 10.

The sensitive paper and the original or flexible negative having beenlaid' upon the base, the celluloid sheet is laid over the same by meansof the roller until the shaft 6 enters sockets 11 formed in brackets 12secured to the frame. Latches 13 are then caused to engage lugs 14 onthe brackets, thus retaining the shaft in position in the sockets. Theoperator then turns the handle transmitting a rotary nfovement to theroller through the interposed spring, so that thereby tension is appliedto the celluloid sheet, causing it and the underlying sheets to lie veryclose to each other on the convexbase. As the shaft is turned toenergize the spring, a pawl 15 secured upon one of the brackets engagesin succession the teeth of the ratchet wheel 9 and prevents the returnof the shaft. When the shaft has been turned to provide sufficienttension upon the celluloid sheet, the apparatus is ready for exposure.To release the shaft,

it is only necessary to remove the pawl from the ratchet wheel, and thendisengage the latches from the lugs. The celluloid sheet is then woundup on the roller, and the original and print removed.

The advantages of this construction over prior forms of photographicprinting frames for blue printing and the like are that, no glass beingused, the risk of loss through breakage of glass is eliminated; theframe can be arranged for exposure and opened in a small fraction of thetime required with some prior frames; the use of felt or other paddingis no longer required; and the device is lighter and more easily handledthan certain printing frames of the old style.

I claim 1. In a photographic printing frame, the combination of anarched or convex smooth baseor foundation. :1 sheet of translucentflexible material secured at one end to one end of said arched base, andmeans for securing the other end of said sheet at the other end thereofand for drawing the sheet tight over the base, substantially asdescribed.

2. In a photographic printing frame, the combination of an arched orconvex smooth base or foundation, :1 sheet of translucent flexiblematerial secured at one end to one end of said arched base, and meansfor securing the other end of said sheet at the other end thereof andfor drawing the sheet tight over the base, comprising a roller to whichthe sheet is secured, a shaft therefor, a spring connecting the rollerand shaft, and means for turning said shaft, substantially as described.

3. In a photographic printing frame, the combination of an arched orconvex smooth base-or foundation, :1 sheet of translucent flexiblematerial secured at one end to one end of said arched base, a roller towhich the other end is secured, a shaft for the roller, a coiled springaround the shaft connected thereto and to the roller, sockets for theshaft at the other end of the base or foundation, and means for turningthe shaft in the sockets to wind up the spring, and apply tension to thesheet, substantially as described.

4. In a. photographic printing frame, the combination of an arched orconvex smooth base or foundation, a sheet of translucent flexiblematerial secured at one end to one end of said base, a roller to whichthe other end is secured, a

,shaft for said roller, a coiled spring around the shaft connectedthereto and to the roller, sockets for the shaft at the other end of thebase or foundation, means'for removabiy securing the shaft in thesockets, and means for turning the shaft in the sockets to wind up thespring, and apply tension to the sheet, substantially as described.

5. In a photographic printing frame, the combination of an arched orconvex smooth base or foundation, a sheet of translucent flexiblematerial secured at one end to one end of said base, a roller to whichthe other end is secured, a

shaft for said roller, a coiled spring around the shaft connectedthereto and to the roller, sockets for the shaft at the other end of thebase or foundation, means for turning the shaft in the sockets, andmeans for holding the roller in the position to which it is turned,substantially as described.

6. In a photographic printing frame. the combination of an arehed orconvex smooth base or foundation. :1 sheet of lranslueent ilexihlemni'erini secured nt. one end to one end of said base. a roiier to whichthe other end is sernred. a shaft for said roller. a coiled springaround the shaft eonneeted thereto and to the roiier, sockets for theshaft. at the other end of the base or foundation, means for turning theshaft in the sockets, and means for holding the roiier in position towhich it is turned, said means comprising :1

10 ratchet wheel carried by the roller and a pawl carried by 1 the frameand adapted to engage said ratchet wheel when the shaft. has been movedinto said sockets. suhstantiniLv iili deflerihed.

In testimony whereof I have hereunto set my hand in the presence of tn'osubscribing witnesses.

JUL] EN A. BIUED.

Witnesses I M. 'nmn'r, B. Naoos.

